Bolshoi Semiachik

Photo of this volcano
  • Country
  • Volcanic Region
  • Primary Volcano Type
  • Last Known Eruption
  • 54.32°N
  • 160.02°E

  • 1720 m
    5642 ft

  • 300150
  • Latitude
  • Longitude

  • Summit
    Elevation

  • Volcano
    Number

The Global Volcanism Program has no activity reports for Bolshoi Semiachik.

The Global Volcanism Program has no Weekly Reports available for Bolshoi Semiachik.

The Global Volcanism Program has no Bulletin Reports available for Bolshoi Semiachik.

Eruptive History


Summary of Holocene eruption dates and Volcanic Explosivity Indices (VEI).


Start Date Stop Date Eruption Certainty VEI Evidence Activity Area or Unit
4450 BCE (?) Unknown Confirmed   Radiocarbon (corrected) Korona and Yezh lava domes
6800 BCE ± 300 years Unknown Confirmed   Radiocarbon (uncorrected) Ivanov lava dome

This compilation of synonyms and subsidiary features may not be comprehensive. Features are organized into four major categories: Cones, Craters, Domes, and Thermal Features. Synonyms of features appear indented below the primary name. In some cases additional feature type, elevation, or location details are provided.

Photo Gallery


Bolshoi ("Big") Semiachik is a group of Late Pleistocene-Holocene stratovolcanoes and extrusive domes located within a large caldera. The massif is seen here from the western rim of the caldera (Bort ridge). Bolshoi Semiachik (Zubchatka or Zubchatyi) volcano per se is the large Late-Pleistocene edifice on the left-center horizon. Several Holocene extrusive domes and vigorously active thermal fields are located west and SW of the volcano.

Copyrighted photo by Nikolai Smelov (Holocene Kamchataka volcanoes; http://www.kscnet.ru/ivs/volcanoes/holocene/main/main.htm).
See title for photo information.

Smithsonian Sample Collections Database


The following 1 samples associated with this volcano can be found in the Smithsonian's NMNH Department of Mineral Sciences collections. Catalog number links will open a window with more information.

Catalog Number Sample Description
NMNH 116543-12 Andesite

Affiliated Sites